Structural and Electronic Properties of Cubic CeO2: Unpaired Electrons in CeO2

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Show simple item record Quintanar, C Caballero, R Barreto, J Chavira, E Marinero, EE 2011-01-21T09:04:21Z 2011-01-21T09:04:21Z 2010
dc.identifier.issn 0020-7608
dc.identifier.uri http://hdlhandlenet/123456789/174
dc.description.abstract The high performance of cerium dioxide (CeO2) as support for Au in catalysis relies on its ability to anchor Au clusters and transfer charge to the gold nanoparticles. These two processes are governed by oxygen vacancy formation. To study the localization and the mobility of the electrons left behind by the vacancy from the relaxed oxygen, an experimental and theoretical study is hereby reported. CeO2 powder was synthesized by the polyacrylamide gel method and its microstructure was characterized by X-ray diffraction and high resolution scanning electron microscopy. We have determined the presence of only the fluorite cubic phase in our samples and the formation of acicular particles of similar to 1 mu m in length. In the electron spin resonance study, we observed that the unpaired electrons are quasi free. A single-line paramagnetic signal is observed that exhibits spin characteristics with a g-value of 2.0039 at room temperature. This compares well to the value of 2.0023 determined for free electrons. In addition, we have conducted a theoretical study using a density functional theory cluster approach and calculate the electron spin density of CeO2 clusters. We find that spin density clouds are localized around the cerium ions. (C) 2010 Wiley Periodicals, Inc. Int J Quantum Chem 110: 2949-2954, 2010 en_US
dc.language.iso en en_US
dc.title Structural and Electronic Properties of Cubic CeO2: Unpaired Electrons in CeO2 en_US
dc.type Article en_US
dc.identifier.idprometeo 27
dc.identifier.doi 10.1002/qua.22874
dc.source.novolpages 110(15):2949-2954
dc.subject.wos Chemistry, Physical
dc.subject.wos Mathematics, Interdisciplinary Applications
dc.subject.wos Physics, Atomic, Molecular & Chemical
dc.description.index WoS: SCI, SSCI o AHCI
dc.subject.keywords CeO2
dc.subject.keywords oxygen vacancies
dc.subject.keywords electron spin resonance
dc.subject.keywords density functional theory
dc.relation.journal International Journal of Quantum Chemistry

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